The Bigblue HL-450 LED Head Light System delivers a stunning 450 lumens light output through 1 piece of XML LED and an 8/85 degree hot spot. The 6500K white light reflects the true vibrant colors of the surrounding while diving. 4 levels of brightness and SOS controlled by a reliable push button with battery indicator. The light works with 3xAAA batteries. The 4 steps power adjustment lets you choose between four output levels - IV at 100%, III at 50% , II at 25% or I at 10% extending the burn time and reducing reflections at close range. Head Strap included